| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1 | Month and year - information complete | 751 |
97.3%
|
| 5 | Year - month imputed, age calculated | 20 |
2.6%
|
| 7 | Month - date placed | 1 |
0.1%
|
| 8 | None - date placed | 0 |
0%
|
| 9 | From calendar | 0 |
0%
|
| Sysmiss | 4557 |